The question of Turkey's membership in the EU has been the subject of debates about the cosmopolitan future of Europe. Using the concept of cosmopolitanism as developed by Beck, Habermas, and Delanty, this article argues that the possibility of an antiontological and multicultural cosmopolitan European community will largely depend on how Europe answers the question of whether Turkey should be granted membership in the EU. Turkey forces a debate on three crucial areas that are directly related to the cosmopolitan future (...) of Europe: (a) Europe's geopolitical place in the global world, (b) postnational forms of a European public sphere, and (c) European identity. The potential for a multicultural and pluralistic cosmopolitanism is a two-way street, and while Turkey's membership will have a transformative impact on the EU, the membership process will also have a similar impact on Turkish democracy and modernity. (shrink)